East Lake South
East Lake South in Hillsborough County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 110 µg/L.
- Typical in September
- 84°F
- Type
- Hypereutrophic
- Trend
- ↓ Declining
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near East Lake South →
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East Lake South is a highly nutrient-loaded hypereutrophic lake in Hillsborough County, Florida. Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, East Lake South ranks #114 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-09-09. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria B · advisory
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Based on E. coli testing, East Lake South rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.8% of 26 samples across 7 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 110 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 110 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near East Lake South
Compare lakeside cabins, hotels, and vacation rentals near East Lake South in Hillsborough County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around East Lake South are listed below.
Top-rated places to stay near East Lake South
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
East Lake South typically sits around 84°F at the surface in September. Summer average is about 84°F. Usually warmest in Jun (about 84°F) and coldest in Dec (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 31 field readings (2011–2025) via the EPA Water Quality Portal. See the full East Lake South water temperature breakdown →
Fishing East Lake South
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.25 m/yr | 5 |
| Phosphorus | ↓ Declining | +3.34 µg/L/yr | 6 |
EPA Impairment Status
East Lake South is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1579A · Official waterbody report · Matched by proximity (0.37 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of East Lake South under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Envirofocus Technologies LlcTampa · 1.8 mi away · NPDES FL0687138Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #114 of 124 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about East Lake South
Where is East Lake South?
- East Lake South is a lake in Hillsborough County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for East Lake South?
- East Lake South in Hillsborough County, Florida has a water quality grade of D (Nutrient-rich). Phosphorus: 110 µg/L.
Is East Lake South safe to swim in?
- Based on E. coli testing, East Lake South rarely exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 3.8% of 26 samples across 7 seasons. That works out to a bacteria swim-safety grade of B — a historical summary of past testing, not a current reading. East Lake South has a water quality grade of D (Nutrient-rich). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of East Lake South?
- East Lake South typically sits around 84°F at the surface in September, from 31 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
Explore East Lake South across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
23 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples23 samples · 2020–2025
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)